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CVE-2019-9811

21
FAUCET Score

CVE-2019-9811 describes a high-severity sandbox escape vulnerability affecting Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8, demonstrated via a malicious language pack. With a CVSS score of 8.3, this attack requires user interaction and high attack complexity but can lead to complete compromise of confidentiality, integrity, and availability. While it was part of a Pwn2Own entry, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 68.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 60.8CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
< 60.8CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
12CPE matchmatch criteria
cpe:2.3:a:novell:suse_package_hub_for_suse_linux_enterprise:12:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.3HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.57%
Probability of exploitation in next 30 days
EPSS Percentile
83.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0257 is in the 55th percentile among its peer group of 1,572 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

mozillapatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:60.8.0-1.el6_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:60.8.0-1.el6_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:60.8.0-1.el7_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:60.8.0-1.el7_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:60.8.0-1.el8_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: thunderbird-0:60.8.0-1.el8_0
View patch

Vendor Advisories (1)

redhatCVE-2019-9811Important

Mozilla: Sandbox escape via installation of malicious language pack

Jul 10, 2019

References

lists.opensuse.org / opensuse-security-announce/2019-07/msg00055.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2019-07/msg00058.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2019-08/msg00073.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2019-10/msg00011.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2019-10/msg00017.html
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPermissions Required
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingPatchVendor Advisory
bugzilla.mozilla.org / show_bug.cgi
ExploitIssue TrackingVendor Advisory
lists.debian.org / debian-lts-announce/2019/08/msg00001.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2019/08/msg00002.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201908-12
Third Party Advisory
security.gentoo.org / glsa/201908-20
Third Party Advisory
mozilla.org / security/advisories/mfsa2019-21
Vendor Advisory
mozilla.org / security/advisories/mfsa2019-22
Vendor Advisory
mozilla.org / security/advisories/mfsa2019-23
Vendor Advisory